A method for improving corrosion resistance and fatigue resistance of aluminum alloys

Abstract

The invention relates to a method for improving the corrosion resistance and fatigue resistance of an aluminum alloy, comprising: shot peening, determining the depth of a residual compressive stress layer, cleaning, alkali corrosion, pickling, anodizing, and sealing, wherein, after determining the residual compressive stress In the layer depth step, based on the relationship between the shot peening intensity parameter and the residual compressive stress layer depth, the residual compressive stress layer depth Ds is obtained from the preset shot peening intensity parameter. In the alkali corrosion step, according to the alkali corrosion depth Dc and There is an optimal coefficient Y between the depths of the residual compressive stress layer Ds, and the alkali corrosion depth is determined as Dc=Y·Ds. According to the corresponding relationship between the alkali corrosion depth Dc and the alkali corrosion time t, the linear fitting curve Dc=f(t) is established, The corresponding corrosion time is calculated from the depth Ds of the residual compressive stress layer. The method can effectively improve the surface treatment performance of aluminum alloy parts, improve the comprehensive performance of the parts, and then improve the quality and performance of equipment, and has great economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of surface modification of aluminum alloys, in particular to a method for improving the corrosion resistance and fatigue resistance of aluminum alloys. Background technique [0002] Shot peening is an important surface strengthening technique to improve the fatigue resistance of metal materials. The use of reasonable shot peening process parameters can significantly improve the fatigue resistance of aluminum alloys and other metal materials. Shot peening is that when metal parts are hit by high-speed projectiles, slight cold plastic deformation occurs on the surface of the parts, thereby increasing the strength and hardness of the surface of the parts, and generating residual compressive stress on the surface, which is to improve the mechanical parts. A surface treatment technology targeting fatigue strength. [0003] The surface anti-corrosion technology of aluminum alloy mainly includes chemical oxidation...

AI Technical Summary

Problems solved by technology

Due to alkali corrosion, the surface of aluminum alloy is removed to a certain depth, which affects the effect of shot peening in the previous process, thus weakening the effect of shot peening on the fatigue performance of aluminum alloy

[0007] At present, the existing technology has not been able to establish a synergistic matching relationship between shot peening parameters and anodic oxidation pretreatment parameters, so as to ensure that the corrosion resistance and fatigue resistance reach the optimal value

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